CN103249950B - Hybrid hydraulic systems for industrial processes - Google Patents
Hybrid hydraulic systems for industrial processes Download PDFInfo
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- CN103249950B CN103249950B CN201180049902.9A CN201180049902A CN103249950B CN 103249950 B CN103249950 B CN 103249950B CN 201180049902 A CN201180049902 A CN 201180049902A CN 103249950 B CN103249950 B CN 103249950B
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- 239000012530 fluid Substances 0.000 claims abstract description 138
- 238000006073 displacement reaction Methods 0.000 claims abstract description 19
- 230000002457 bidirectional effect Effects 0.000 claims abstract description 3
- 238000005086 pumping Methods 0.000 claims description 36
- 238000000034 method Methods 0.000 claims description 19
- 238000010586 diagram Methods 0.000 description 14
- 238000003860 storage Methods 0.000 description 13
- 230000008520 organization Effects 0.000 description 8
- 238000004088 simulation Methods 0.000 description 8
- 238000012360 testing method Methods 0.000 description 6
- 230000008569 process Effects 0.000 description 5
- 238000013461 design Methods 0.000 description 4
- 238000001746 injection moulding Methods 0.000 description 4
- 238000004513 sizing Methods 0.000 description 4
- 230000005540 biological transmission Effects 0.000 description 3
- 230000008859 change Effects 0.000 description 3
- 238000001595 flow curve Methods 0.000 description 3
- 238000011144 upstream manufacturing Methods 0.000 description 3
- 238000004134 energy conservation Methods 0.000 description 2
- 238000002347 injection Methods 0.000 description 2
- 239000007924 injection Substances 0.000 description 2
- 238000002955 isolation Methods 0.000 description 2
- 238000004519 manufacturing process Methods 0.000 description 2
- 230000008901 benefit Effects 0.000 description 1
- 238000010276 construction Methods 0.000 description 1
- 238000012423 maintenance Methods 0.000 description 1
- 238000005259 measurement Methods 0.000 description 1
- 230000007246 mechanism Effects 0.000 description 1
- 230000009467 reduction Effects 0.000 description 1
Classifications
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B60—VEHICLES IN GENERAL
- B60K—ARRANGEMENT OR MOUNTING OF PROPULSION UNITS OR OF TRANSMISSIONS IN VEHICLES; ARRANGEMENT OR MOUNTING OF PLURAL DIVERSE PRIME-MOVERS IN VEHICLES; AUXILIARY DRIVES FOR VEHICLES; INSTRUMENTATION OR DASHBOARDS FOR VEHICLES; ARRANGEMENTS IN CONNECTION WITH COOLING, AIR INTAKE, GAS EXHAUST OR FUEL SUPPLY OF PROPULSION UNITS IN VEHICLES
- B60K17/00—Arrangement or mounting of transmissions in vehicles
- B60K17/04—Arrangement or mounting of transmissions in vehicles characterised by arrangement, location or kind of gearing
- B60K17/10—Arrangement or mounting of transmissions in vehicles characterised by arrangement, location or kind of gearing of fluid gearing
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F15—FLUID-PRESSURE ACTUATORS; HYDRAULICS OR PNEUMATICS IN GENERAL
- F15B—SYSTEMS ACTING BY MEANS OF FLUIDS IN GENERAL; FLUID-PRESSURE ACTUATORS, e.g. SERVOMOTORS; DETAILS OF FLUID-PRESSURE SYSTEMS, NOT OTHERWISE PROVIDED FOR
- F15B13/00—Details of servomotor systems ; Valves for servomotor systems
- F15B13/02—Fluid distribution or supply devices characterised by their adaptation to the control of servomotors
- F15B13/04—Fluid distribution or supply devices characterised by their adaptation to the control of servomotors for use with a single servomotor
- F15B13/044—Fluid distribution or supply devices characterised by their adaptation to the control of servomotors for use with a single servomotor operated by electrically-controlled means, e.g. solenoids, torque-motors
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
- B29C45/00—Injection moulding, i.e. forcing the required volume of moulding material through a nozzle into a closed mould; Apparatus therefor
- B29C45/17—Component parts, details or accessories; Auxiliary operations
- B29C45/76—Measuring, controlling or regulating
- B29C45/82—Hydraulic or pneumatic circuits
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B60—VEHICLES IN GENERAL
- B60K—ARRANGEMENT OR MOUNTING OF PROPULSION UNITS OR OF TRANSMISSIONS IN VEHICLES; ARRANGEMENT OR MOUNTING OF PLURAL DIVERSE PRIME-MOVERS IN VEHICLES; AUXILIARY DRIVES FOR VEHICLES; INSTRUMENTATION OR DASHBOARDS FOR VEHICLES; ARRANGEMENTS IN CONNECTION WITH COOLING, AIR INTAKE, GAS EXHAUST OR FUEL SUPPLY OF PROPULSION UNITS IN VEHICLES
- B60K6/00—Arrangement or mounting of plural diverse prime-movers for mutual or common propulsion, e.g. hybrid propulsion systems comprising electric motors and internal combustion engines ; Control systems therefor, i.e. systems controlling two or more prime movers, or controlling one of these prime movers and any of the transmission, drive or drive units
- B60K6/08—Prime-movers comprising combustion engines and mechanical or fluid energy storing means
- B60K6/12—Prime-movers comprising combustion engines and mechanical or fluid energy storing means by means of a chargeable fluidic accumulator
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
- F04B—POSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS
- F04B49/00—Control, e.g. of pump delivery, or pump pressure of, or safety measures for, machines, pumps, or pumping installations, not otherwise provided for, or of interest apart from, groups F04B1/00 - F04B47/00
- F04B49/002—Hydraulic systems to change the pump delivery
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
- F04B—POSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS
- F04B49/00—Control, e.g. of pump delivery, or pump pressure of, or safety measures for, machines, pumps, or pumping installations, not otherwise provided for, or of interest apart from, groups F04B1/00 - F04B47/00
- F04B49/10—Other safety measures
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
- F04B—POSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS
- F04B49/00—Control, e.g. of pump delivery, or pump pressure of, or safety measures for, machines, pumps, or pumping installations, not otherwise provided for, or of interest apart from, groups F04B1/00 - F04B47/00
- F04B49/10—Other safety measures
- F04B49/103—Responsive to speed
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F15—FLUID-PRESSURE ACTUATORS; HYDRAULICS OR PNEUMATICS IN GENERAL
- F15B—SYSTEMS ACTING BY MEANS OF FLUIDS IN GENERAL; FLUID-PRESSURE ACTUATORS, e.g. SERVOMOTORS; DETAILS OF FLUID-PRESSURE SYSTEMS, NOT OTHERWISE PROVIDED FOR
- F15B1/00—Installations or systems with accumulators; Supply reservoir or sump assemblies
- F15B1/02—Installations or systems with accumulators
- F15B1/027—Installations or systems with accumulators having accumulator charging devices
- F15B1/033—Installations or systems with accumulators having accumulator charging devices with electrical control means
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F15—FLUID-PRESSURE ACTUATORS; HYDRAULICS OR PNEUMATICS IN GENERAL
- F15B—SYSTEMS ACTING BY MEANS OF FLUIDS IN GENERAL; FLUID-PRESSURE ACTUATORS, e.g. SERVOMOTORS; DETAILS OF FLUID-PRESSURE SYSTEMS, NOT OTHERWISE PROVIDED FOR
- F15B1/00—Installations or systems with accumulators; Supply reservoir or sump assemblies
- F15B1/26—Supply reservoir or sump assemblies
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F15—FLUID-PRESSURE ACTUATORS; HYDRAULICS OR PNEUMATICS IN GENERAL
- F15B—SYSTEMS ACTING BY MEANS OF FLUIDS IN GENERAL; FLUID-PRESSURE ACTUATORS, e.g. SERVOMOTORS; DETAILS OF FLUID-PRESSURE SYSTEMS, NOT OTHERWISE PROVIDED FOR
- F15B21/00—Common features of fluid actuator systems; Fluid-pressure actuator systems or details thereof, not covered by any other group of this subclass
- F15B21/08—Servomotor systems incorporating electrically operated control means
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16H—GEARING
- F16H61/00—Control functions within control units of change-speed- or reversing-gearings for conveying rotary motion ; Control of exclusively fluid gearing, friction gearing, gearings with endless flexible members or other particular types of gearing
- F16H61/38—Control of exclusively fluid gearing
- F16H61/40—Control of exclusively fluid gearing hydrostatic
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F15—FLUID-PRESSURE ACTUATORS; HYDRAULICS OR PNEUMATICS IN GENERAL
- F15B—SYSTEMS ACTING BY MEANS OF FLUIDS IN GENERAL; FLUID-PRESSURE ACTUATORS, e.g. SERVOMOTORS; DETAILS OF FLUID-PRESSURE SYSTEMS, NOT OTHERWISE PROVIDED FOR
- F15B2201/00—Accumulators
- F15B2201/50—Monitoring, detection and testing means for accumulators
Landscapes
- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Physics & Mathematics (AREA)
- Fluid Mechanics (AREA)
- Chemical & Material Sciences (AREA)
- Manufacturing & Machinery (AREA)
- Combustion & Propulsion (AREA)
- Transportation (AREA)
- Analytical Chemistry (AREA)
- Fluid-Pressure Circuits (AREA)
- Control Of Positive-Displacement Pumps (AREA)
Abstract
A hydraulic drive system for driving a load includes a drive shaft; first and second hydraulic pumps driven by the drive shaft, and a control system that operates the hydraulic drive system in a plurality of modes including: a) a first mode where the second hydraulic pump pumps hydraulic fluid from a supply line to an accumulator; b) a second mode where the second hydraulic pump pumps hydraulic fluid from the accumulator to the supply line; c) a third mode where the second hydraulic pump pumps hydraulic fluid from the supply line to a reservoir; and d) a fourth mode where the second hydraulic pump pumps hydraulic fluid from the reservoir to the supply line. At least the second hydraulic pump is a variable displacement bidirectional pump.
Description
The cross reference of related application
The application submits on October 14th, 2011 as pct international patent application, for the whole designated states except the U.S. using Federal Corporation Eaton (Eton) company as claimant, and only for this designated state of the U.S. using Chinese citizen QingHui Yuan and citizen of india AnkurGanguli as claimant, this application claims the U.S. Patent Application Serial 61/393 submitted on October 15th, 2010, the preference of 556, the disclosure of this application is incorporated herein in full by reference with it.
Background technique
In the hydraulic system of some routines, fixed displacement pump supplies fluid to one or more load source.The loading demand of load source changes in a duty cycle.The size of fixed displacement pump is determined to be the maximum load being suitable for adapting to require during work cycle.Therefore, for the suitable major part of work cycle, pump may be oversize.
Summary of the invention
Aspects more of the present invention relate to the hydraulic system with repeated work circulation (i.e. work cycle).Described hydraulic system comprises at least one variable delivery pump and at least one accumulator, to supply fluid to the load portion section of system.Control system determines when that accumulator (needs) is filled or discharges.In some embodiments, system also comprises the fixed displacement pump with variable delivery pump coupled in series.
Multiple additional aspect of the present invention will be set forth in the following description.Aspect of the present invention can relate to the combination of independent characteristic sum feature.Should be understood that, aforesaid generality illustrates and detailed description is subsequently only schematically and illustrative, be not restriction the present invention wide in range inventive concept---embodiment disclosed herein is based on this inventive concept.
Accompanying drawing explanation
Fig. 1 is hydraulic circuit diagram, shows the fixed displacement pump of the load portion section being configured to the exemplary hydraulic system supplied fluid to according to principle of the present invention;
Fig. 2 is hydraulic circuit diagram, shows the variable delivery pump of the load portion section being configured to another exemplary hydraulic system supplied fluid to according to principle of the present invention;
Fig. 3 is hydraulic circuit diagram, shows the variable displacement pump-unit being configured to load portion section fluid being supplied to another exemplary hydraulic system according to principle of the present invention along supply route;
Fig. 4 is form, shows the drive pattern of corresponding loading demand;
Fig. 5 is flow chart, illustrates the operating process for exemplary control procedure 400, can in order to the drive circuit of application drawing 3;
Fig. 6 is circuit diagram, shows and flows through the fluid of drive circuit when drive circuit is configured to fill pattern;
Fig. 7 is circuit diagram, and the fluid shown when drive circuit is configured to dump (dump) pattern through drive circuit flows;
Fig. 8 is circuit diagram, shows and flows through the fluid of drive circuit when drive circuit is configured to normal mode;
Fig. 9 is circuit diagram, shows and flows through the fluid of drive circuit when drive circuit is configured to release mode;
Figure 10 is plotted curve, shows and has in the exemplary hydraulic system of Example load curve in example work cycle, along with time course is from each pump to the fluid flow of supply lines Ps;
Figure 11 is plotted curve, and the peak power of operating pumps of being used for that depicting is provided by motor does not have the difference between the Hydraulic Power Transmission System (triangle line) of accumulator and the Hydraulic Power Transmission System (circle line) with accumulator; With
Figure 12 is flow chart, illustrates the operating process for example design and selection course, in order to design and the pump-unit as shown in Figure 3 of the hydraulic system that stylizes.
Embodiment
Fig. 1 is hydraulic circuit diagram, and the power showing the load portion section 130 (such as, injector) for having repeated work circulation provides the hydraulic drive circuit 100 of operation.Drive circuit 100 comprises fixed displacement pump 110, and this fixed displacement pump is configured to the load portion section 130 supplying fluid to exemplary hydraulic system.Electronic control unit (ECU) 116 manages VFD 114.
Pump 110 has entrance 111 and outlet 113.Entrance 111 is connected to cistern 105 (i.e. storage tank), and outlet 113 is connected to flow control valve 120 and safety valve 125.There is motor 112 (such as electric motor) driven pump 110 of variable frequency drives (VFD) 114, with pumping fluid from cistern 105, the fluid of Variable quantity is supplied to system.Safety valve 125 carrys out control pump outlet pressure (i.e. hydraulic system pressure) by making unnecessary flow forward cistern 105 to.Flow control valve 120 controls the flow being supplied to the hydraulic fluid of actuator.In some embodiments, flow control valve 120 and safety valve 125 are Proportional valves.
In an illustrated embodiment, load portion section 130 comprises the first load source 132, second load source 134 and the 3rd load source 136.In other implementations, hydraulic system can have the load source of more or less quantity.In some embodiments, each load source 132,134,136 comprises machine actuators (such as, injector, fixture, screw rod etc.).Each actuator 132,134,136 is connected to flow control valve 120 respectively by valve 131,133,135.In an illustrated embodiment, the first valve 131 and the second valve 133 are three-position valves, and the 3rd valve 135 is two Proportional valves.But in other implementations, valve 131,133,135 can have the number of states of any expectation.
Each actuator 132,134,136 changes between movable (working) state and cut out (stand-by/inoperative) state, in ambulatory situations, actuator 132,134,136 needs to come the fluid stream of self-pumping 110, in off position, actuator 132,134,136 and pump 110 are isolated.Valve 131,133,135 is communicated with the fluid of actuator 132,134,136 for opening and closing.In some embodiments, at any time, a load source 132,134,136 is only had to be movable.In other implementations, multiple actuator 132,134,136 can be simultaneously movable.In some embodiments, actuator 132,134,136 performs repeating of task, and therefore the loading demand of each actuator 132,134,136 changes according to work cycle.
Such as, in some embodiments, hydraulic system comprises adapted to injection system.In more such systems, first load source 132 comprises the oil hydraulic cylinder providing power to fixture, second load source 134 comprises the oil hydraulic cylinder of the auger (auger) moving axially injector, and the 3rd load source 136 comprises the oil hydraulic motor of the auger of rotary syringe.But in other implementations, each load source 132,134,136 can comprise the hydraulic actuator of any desired type.Although machine loading portion section 130 is described as injection moulding machine, it is intended that aspect of the present invention is suitable for the hydraulic driving machine of any type.Especially, aspect of the present invention is suitable for having the hydraulic press of repeated work circulation, is wherein changed according to predetermined curve by the hydraulic load of machine demand and hydraulic flow load in a duty cycle.
Hydraulic drive circuit 100 has such structure, and power can be made to produce for it and power consumpiton is mated effectively, thus reduces throttling power loss.In some embodiments, one or more accumulator 150 can be connected to hydraulic drive circuit 100 in the upstream of flow control valve 120.In other implementations, one or more accumulator 150 can be connected to hydraulic drive circuit 100 concurrently with flow control valve 120.Such as, a kind of like this disclosure of parallel organization drive circuit together can submitted to the application, and the U.S. Application No of the common pending trial that name is called " Hydraulic Drive Circuit with ParallelArchitectured Accumulator (having the hydraulic drive circuit of parallel organization accumulator) " _ _ _ _ [attorney 15720.0122USU1] in see, this application require on October 18th, 2010 submit to, the U.S.Provisional Application No 61/393 that name is called " Parallel ArchitecturedIntelligent Accumulator (PAIA) for Energy Saving (for energy-conservation parallel organization intelligence accumulator (PAIA)) ", the preference of 968, the disclosure of above-mentioned two applications is incorporated herein by reference at this.
Usually, VFD 114 driven pump 110 is to be supplied to load portion section 130 by the fluid with specific pressure and flow.In a duty cycle when load is lower than in period during the first predetermined threshold, control valve unit 155 guides the fluid of a part of pumping to fill accumulator 150.In period in a duty cycle when the load required is greater than the second predetermined threshold, control valve unit 155 makes accumulator 150 discharge to guide additional fluid to flow to load portion section 130.
When loading demand is between the first and second threshold values, accumulator 150 (such as by control valve unit 155) is isolated with the remaining part of hydraulic system.When accumulator 150 is isolated, motor 112, VFD 114 and pump 110 run in a conventional mode.In some embodiments, the first and second threshold values are configured to accumulator 150 is isolated with the remaining part of hydraulic system in a large portion of work cycle.In some embodiments, the first and second predetermined thresholds based on work cycle and special system load request and tentatively set.
Fig. 2 is hydraulic circuit diagram, and the power showing the load portion section 230 (such as, injection moulding machine) for having repeated work circulation provides the hydraulic drive circuit of operation.Drive circuit 200 comprises variable delivery pump 210, and this variable delivery pump is configured to the load portion section 230 supplying fluid to another exemplary hydraulic system.Pump 210 has entrance 211 and outlet 213.Variable delivery pump 210 passes through entrance 211 from supply storage tank 205 pumping fluid.ECU 216 control ratio valve 214 is to be supplied to system from outlet 213 by fluid stream selectively.The pump 210 driven by motor (such as, electric motor) 212 is according to load sensing signal LS alter flow.Variable delivery pump 210 is connected to load portion section 230 by the Proportional valve 220 being positioned at Proportional valve 214 downstream.Ratio safety valve 225 allows excessive fluid to turn back to storage tank 205 from variable delivery pump 210.
In an illustrated embodiment, load portion section 230 comprises the first load source 232, second load source 234 and the 3rd load source 236.In other implementations, hydraulic system can have the load source of more or less quantity.In some embodiments, each load source 232,234,236 comprises machine actuators (such as, injector, fixture, screw rod etc.).Each actuator 232,234,236 is respectively by valve 231,233,235 connection traffic control valve 220.In an illustrated embodiment, the first valve 231 and the second valve 233 are three-position valves, and the 3rd valve 235 is two Proportional valves.But in other implementations, valve 231,233,235 can have the number of states of any expectation.
Each actuator 232,234,236 is changed between active state and closed condition, and in ambulatory situations, actuator 232,234,236 needs to come the fluid stream of self-pumping 210, and in off position, actuator 232,234,236 and pump 210 are isolated.Valve 231,233,235 is communicated with the fluid of actuator 232,234,236 for opening and closing.In some embodiments, a load source 232,234,236 is only had to be movable at any time.In other implementations, multiple actuator 232,234,236 can be simultaneously movable.In some embodiments, actuator 232,234,236 performs repeating of task, and therefore the loading demand of each actuator 232,234,236 changes according to work cycle.
Such as, in some embodiments, hydraulic system comprises adapted to injection system.In more such systems, first load source 232 comprises the oil hydraulic cylinder providing power to fixture, second load source 234 comprises the oil hydraulic cylinder of the auger moving axially injector, and the 3rd load source 236 comprises the oil hydraulic motor of the auger of rotary syringe.But in other implementations, each load source 232,234,236 can comprise the hydraulic actuator of any desired type.Although machine loading portion section 230 is described as injection moulding machine, it is intended that aspect of the present invention is suitable for the hydraulic driving machine of any type.Especially, aspect of the present invention is suitable for having the hydraulic press of repeated work circulation, is wherein changed according to predetermined curve by the hydraulic load of machine demand and hydraulic flow load in a duty cycle.
Hydraulic drive circuit 200 has such structure, and power can be made to produce for it and power consumpiton is mated effectively, thus reduces throttling power loss.Accumulator 250 is connected to hydraulic drive circuit 200 in the downstream of the upstream of Proportional valve 220 and ratio safety valve 225.In some embodiments, one or more accumulator 250 can be connected to hydraulic drive circuit 200 in the upstream of flow control valve 220.In other implementations, one or more accumulator 250 can be connected to hydraulic drive circuit 200 concurrently with flow control valve 220.Such as, a kind of like this disclosure of parallel organization drive circuit together can submitted to the application, and the U.S. Application No of the common pending trial that name is called " Hydraulic Drive Circuitwith Parallel Architectured Accumulator (having the hydraulic drive circuit of parallel organization accumulator) " _ _ _ _ in see, this application require on October 18th, 2010 submit to, the U.S.Provisional Application No 61/393 that name is called " for energy-conservation parallel organization intelligence accumulator (PAIA) ", the preference of 968, the disclosure of above-mentioned two applications is incorporated herein by reference at this.
Usually, suitable fluid stream is supplied to the load portion section 230 of hydraulic system 200 by variable delivery pump 210 based on Loadsensing control signal LS.In a duty cycle when the load required is lower than in period during the first predetermined threshold, control valve unit 255 guides the fluid of a part of pumping to fill accumulator 250.In period in a duty cycle when the load required is greater than the second predetermined threshold, control valve unit 255 makes accumulator 250 discharge to guide additional fluid to flow to load portion section 230.
When loading demand is between the first and second threshold values, accumulator 250 is isolated by the remaining part of control valve unit 255 with hydraulic system.When accumulator 250 is isolated, variable delivery pump 210 runs in a conventional mode.In some embodiments, the first and second threshold values are configured to accumulator 250 is isolated with the remaining part of hydraulic system 200 in a large portion of work cycle.In some embodiments, the first and second predetermined thresholds based on work cycle and special system load request and tentatively set.
Fig. 3 is hydraulic circuit diagram, and the power showing the load portion section 330 (such as, injection moulding machine) for having repeated work circulation provides the hydraulic drive circuit 300 of operation.Drive circuit 300 comprises variable displacement pump-unit 301, and this variable displacement pump-unit is configured to the load portion section 330 fluid being fed to another exemplary hydraulic system along supply lines Ps.In some embodiments, load portion section 330 is identical with the load portion section 130 of Fig. 1 or the load portion section 230 of Fig. 2.But in other implementations, load portion section 330 can comprise the load source of any desired amt and/or type.Excessive fluid from cistern 305 pumping fluid, and is dumped to cistern 305 by variable displacement pump-unit 300.
Variable displacement pump-unit 300 comprises motor (such as electric motor) 310, and it drives at least the first pump 312 and the second pump 314 by live axle 319.At least the second pump 314 is two-way pumps.In some embodiments, the second pump 314 is variable delivery pumps.In an illustrated embodiment, the first pump 312 is one-way pumps of fixed displacement.In other implementations, the first pump 312 can be variable delivery pump.In other other mode of execution, pump-unit 300 can comprise additional pump (such as fixed displacement pump and/or variable delivery pump).The pump 312,314 of pump-unit 300 is connected in series to supply lines Ps.
Motor 310 drives the first pump 312 consistently, to supply fluid to load portion section 330 from storage tank 305 pumping fluid from pump discharge 313 by pump intake 311.Bidirectional variable displacement pump 314 has first 315 and second mouthful 317.Along with driving first pump 312, motor 310 also drives variable delivery pump 314 consistently.But because variable delivery pump 314 is two-way, therefore each mouth 315,317 alternately can be used as entrance and exit.
ECU 316 provides control signal U1, and for controlling, when variable delivery pump 314 guides fluid at first direction, and when the second pump 314 guides fluid in second direction.When control signal U1 makes the second pump 314 guide fluid at first direction, second pump 314 guide the fluid (that is, by fluid that the first pump 312 obtains from storage tank 305) of self-pumping supply lines Ps through second mouthful 317, through first 315 to fed lines F.But, when control signal U1 makes the second pump 314 guide fluid in second direction, the second pump 314 guide from fed lines F fluid through first 315, through second mouthful 317 to pump supply lines Ps.
Fed lines F is connected to storage tank 305 and comprises the accumulator apparatus of at least one accumulator 340 by three position directional valve 320 selectively.The selector valve 320 of some type also will selectively from storage tank 305 and accumulator apparatus isolation fed lines F.Selector valve 320 comprises feed port 321, accumulator mouth 323 and cistern mouth 325.In an illustrated embodiment, selector valve 320 is configured to move between three positions.In meta (such as, middle) position, selector valve 320 is not connected with any mouth 321,323,325.Therefore, fed lines F can not be fluidly connected to accumulator apparatus or storage tank 305 by valve 320.When moving to left side, feed port 321 is connected to accumulator mouth 323 by selector valve 320, is fluidly connected by fed lines F thus with accumulator apparatus.When moving to right side, feed port 321 is connected to cistern mouth 325 by selector valve 320, is fluidly connected by fed lines F thus with cistern 305.
In the embodiment shown in fig. 3, accumulator apparatus comprises an accumulator 340.But, in other implementations, accumulator apparatus can comprise as with the application together submit to and name be called the U.S. Application No of the common pending trial of " Hydraulic Drive Circuit with Parallel Architectured Accumulator (there is the hydraulic drive circuit of parallel organization accumulator) " _ _ _ _ as shown in accumulator array, content disclosed in it is incorporated herein by quoting as above.This application also discloses the parallel organization for accumulator apparatus, and it can utilize in drive circuit 300.
In some embodiments, selector valve 320 is moved by solenoid 322, and solenoid is controlled by the control signal U2 produced by ECU318.In some embodiments, ECU 318 is identical with ECU 316.In other implementations, two independent ECU 316,318 can be set.In some embodiments, selector valve 320 also can spring biased in one or two direction (see spring 324).
Usually, the first pump 312 and the second pump 314 coordinate and fluid is provided to supply lines Ps uses for load portion section 330.First pump 312 supplies constant fluid from storage tank 305 and flows to load portion section 330.According to the drive pattern of drive circuit 300, second pump 314 guides fluid from cistern 305 to power supply circuit Ps, guide fluid from accumulator 340 to power supply circuit Ps, guide a part of fluid to output to accumulator 340 from the first pump 312, or guide fluid from pump 314 to cistern 305.Drive pattern based on any given time in a duty cycle load request and change.
Fig. 4 is form, shows the drive pattern of corresponding loading demand.As shown in the figure, when load portion section 330 has low loading demand (such as, when the loading demand of load portion section 330 is less than first threshold T1), ECU 316 provides control signal U1 to indicate the second pump 314 that fluid is directed to fed lines F at first direction from supply lines Ps.During low-power requirements, drive circuit 300 can be configured to fill or dump pattern.When being configured to fill pattern, ECU 318 provides control signal U2 to indicate selector valve 320 that fed lines F is connected to accumulator 340.When being configured to dump pattern, ECU 318 provides control signal U2 to indicate selector valve 320 that fed lines F is connected to cistern 305.
When load portion section 330 has standard load demand (such as, when the loading demand of load portion section 330 is greater than first threshold T1 and is less than Second Threshold T2), ECU 316 provides control signal U1 to indicate the second pump 314 that fluid is directed to supply lines Ps in second direction from fed lines F.ECU 318 provides control signal U2 to indicate selector valve 320 that fed lines F is connected to cistern 305.Therefore, except the fluid supplied by the first pump 312, fluid is directed to supply lines Ps from storage tank 305 pumping fluid by second pump 314 effectively.
When load portion section 330 has high capacity demand (such as, when the loading demand of load portion section 330 is greater than Second Threshold T2), ECU 316 provides control signal U1 to indicate the second pump 314 that fluid is directed to supply lines Ps in second direction from fed lines F.ECU 318 provides control signal U2 to indicate selector valve 320 that fed lines F is connected to accumulator 340.Therefore, except the fluid supplied by the first pump 312, fluid is directed to supply lines Ps from accumulator 340 pumping fluid by second pump 314 effectively.
Fig. 5 is flow chart, illustrates the operating process for exemplary control procedure 400, can in order to the drive circuit 300 of application drawing 3.In some embodiments, exemplary control procedure 400 is implemented by one or more electronic control unit (ECU 316 of such as Fig. 3 and ECU 318).In other implementations, exemplary control procedure 400 can be performed by any other electronic processors.Exemplary control procedure 400 from module 402 start, perform any suitable initialize routine, and proceed to acquisition operation 404.
Obtain the present load demand that hydraulic system is determined in operation 404.In some embodiments, obtain operation 404 clock time is compared with the predetermined work cycle of hydraulic system.In other implementations, obtain operation 404 reception control signal, the current state relative to predetermined work circulation of this control signal indication mechanism.In other implementations, obtain operation 404 and utilize one or more sensor measurement hydrodynamic pressure in hydraulic system and fluid flow.
First determination module 406 judges whether present load demand is less than the first predetermined threshold T1, if present load demand is less than the first predetermined threshold T1, then the first pump position operation 408 makes the second pump 314 guide fluid at first direction.Such as, control signal U1 can be sent to the second pump 314, to make the second pump 314, fluid be directed to fed lines F from supply lines Ps by ECU 316.
Second determination module 410 judges whether accumulator (accumulator 340 of such as Fig. 3) is full of.If accumulator 340 is not full of, then the first valve position operation 412 moves selector valve 320 fed lines F is connected to accumulator (A) 340 for filling.Such as, ECU 318 can instruction solenoid 322 so that the selector valve 320 of Fig. 3 is moved towards left side.Therefore, second pump 314 pumps fluid into accumulator 340 from supply lines Ps pumping fluid through fed lines F.Control procedure 400 perform any suitably complete program and termination module 420 terminate.
Such as, Fig. 6 is circuit diagram, shows and flows through the fluid of drive circuit 300 when drive circuit 300 is configured to fill pattern.In figure 6, ECU 316 instruction second pump 314 guides fluid to fed lines F from supply lines Ps.Feed lines crossing 321, with mobile selector valve 320, is connected to accumulator mouth 323 by ECU 318 instruction solenoid 322.Therefore, fluid flow to supply lines Ps from the first pump 312.To be aspirated from supply lines Ps by the second pump 314 from a part of fluid of the first pump 312 and be directed into accumulator 340.Because fluid flows at first direction, valve connection as shown in Figure 6 extends to accumulator mouth 323 from feed port 321.But should be understood that, according to the direction of the second pump 314, this connection is two-way.
Referring again to Fig. 5, but if the second determination module 410 determines that accumulator 340 is full of, then the second valve position operation 414 moves selector valve 320 fed lines F to be connected to cistern (T) 305.Such as, ECU 318 can instruction solenoid 322 so that the selector valve 320 of Fig. 3 is moved towards right side.Therefore, fluid is dumped to storage tank 305 through fed lines F from supply lines Ps pumping fluid by second pump 314.Control procedure 400 perform any suitably complete program and termination module 420 terminate.
Such as, Fig. 7 is circuit diagram, shows and flows through the fluid of drive circuit 300 when drive circuit 300 is configured to dump pattern.In the figure 7, ECU 316 instruction second pump 314 guides fluid from supply lines Ps to fed lines F.Feed port 321, with mobile selector valve 320, is connected to cistern mouth 325 by ECU 318 instruction solenoid 322.Because fluid flows at first direction, valve connection as shown in Figure 7 extends to cistern mouth 325 from feed port 321.But should be understood that, according to the direction of the second pump 314, this connection is two-way.
In example transmission system 300 as shown in Figure 7, fluid flow to supply lines Ps from the first pump 312.To be aspirated from supply lines Ps by the second pump 314 from a part of fluid of the first pump 312 and be directed into cistern 305.Alternatively, in other embodiments, ECU 316 can instruction second pump 314 at second direction pumping fluid, with from cistern 305 pumping fluid.In other other mode of execution, ECU 318 can movement of valve 320 so that both accumulator 340 and cistern 305 are isolated with fed lines F.
Referring again to Fig. 5, but if the first judge module 406 determines that present load demand exceedes first threshold, then the second pump position operation 416 makes the second pump 314 guide fluid in second direction.Such as, control signal U1 can be sent to the second pump 314, to make the second pump 314, fluid be directed to supply lines Ps from fed lines F by ECU 316.
3rd determination module 418 judges that whether present load demand is more than the second predetermined threshold T2.If present load demand does not exceed Second Threshold, then the second valve position operation 414 moves selector valve 320 so that fed lines F is connected to storage tank 305.Second pump 314 pumps fluid into supply lines Ps from storage tank 305 through fed lines F pumping fluid.Therefore, the first pump 312 and the second pump 314 coordinate that fluid is supplied to load portion section 330 from cistern 305.Control procedure 400 perform any suitably complete program and termination module 420 terminate.
Such as, Fig. 8 is circuit diagram, shows and flows through the fluid of drive circuit 300 when drive circuit 300 is configured to normal mode.In fig. 8, ECU 316 instruction second pump 314 guides fluid from fed lines F to supply lines Ps.Feed port 321, with mobile selector valve 320, is connected to cistern mouth 325 by ECU 318 instruction solenoid 322.Therefore, fluid flow to supply lines Ps from the first pump 312 with from the second pump 314.Second pump 314 is from cistern 305 pumping fluid.
But, if present load demand exceedes Second Threshold really, then first valve position operation 412 move selector valve 320 with fed lines F is connected to accumulator 340 be used for release.Therefore, second pump 314 pumps fluid into supply lines Ps through fed lines F from accumulator 340 pumping fluid.Control procedure 400 perform any suitably complete program and termination module 420 terminate.
Such as, Fig. 9 is circuit diagram, shows and flows through the fluid of drive circuit 300 when drive circuit 300 is configured to release mode.In fig .9, ECU 316 instruction second pump 314 guides fluid from fed lines F to supply line ball road Ps.Feed lines crossing 321, with mobile selector valve 320, is connected to accumulator mouth 323 by ECU 318 instruction solenoid 322.Therefore, fluid flow to supply lines Ps from the first pump 312 with from the second pump 314.Second pump 314 is from accumulator 340 pumping fluid.
Figure 10 is plotted curve 800, shows and has in the exemplary hydraulic system of Example load curve in example work cycle, along with time course to be pumped into the fluid flow of supply lines Ps from each pump 312,314.Curve map values generates in numerical simulation.Because plotted curve 800 is the general trends for the fluid flowing during showing multiple drive modes, is unessential for the purpose of the present invention from simulating the initial data obtained.
Plotted curve 800 shows the flow velocity of the first pump 312 (circle line) keeping constant in whole work cycle, and the fluid output quantity of the second pump (triangle line) changes along with work cycle.Especially, in some work circulation, the flow velocity of the second pump 314 is reduced to zero (such as, 0 milliliters/second).As represented in fig. 8, when the second pump 314 guides fluid from fed lines F to supply lines Ps (such as, when the second pump 314 is from cistern 305 or accumulator 340 pumping fluid), the flow velocity of the second pump 314 be on the occasion of.When the second pump 314 guides fluid from supply lines Ps to fed lines F (such as, when filling accumulator 340), the flow velocity of the second pump 314 is negative values.
But when the loading demand of load portion section 330 is lower than in time during the first predetermined threshold in system duty cycle, ECU 316 provides control signal U1 to indicate the second pump 314 to guide fluid from supply lines Ps to fed lines F.In addition, ECU 318 provides the second control signal U2 to indicate selector valve 320 that fed lines F is connected to accumulator 340.Therefore, the second pump 314 effectively guides and arrives accumulator 340 to fill accumulator 340 from the fluid of supply lines Ps through fed lines F at least partially.
Figure 11 is plotted curve 700, depicts and provides the peak power of operating pumps 312,314 not having the difference between the hydraulic driving system (triangle line) of accumulator and the hydraulic driving system (circle line) with accumulator by motor 310.Curve map values generates in numerical simulation for the exemplary hydraulic system in example work cycle with Example load curve.Usually how affecting the power demand of motor 310 because plotted curve 700 is increases for showing accumulator 340, is unessential from simulating the initial data obtained for the present invention.
It can be seen, if do not utilize accumulator 340, then electric motor exports the pump 312,314 that first order power P 1 operates drive circuit 300.If make use of accumulator 340, then electric motor exports the pump 312,314 that second level power P 2 operates drive circuit 300.Second level power P 2 is less than first order power P 1 (see arrow).Therefore, when accumulator 340 is added in drive circuit 300, the size of motor 310 can reduce compared with motor 310 necessary when drive circuit 300 does not comprise accumulator 340.The reduction of motor dimension has multiple advantage.The first, less motor tend to make purchase and maintenance cost cheaper.The second, the scope reducing the power demand that will be exported by motor can make motor operate in the operating range that it is desirable more at large, which increases the efficiency of motor.
Figure 12 is flow chart, illustrates the operating process for example design and selection course 500, in order to design and the pump-unit 300 as shown in Figure 3 of the hydraulic system that stylizes.Such as, in some embodiments, selection course 500 can be used for the ECU 316,318 that stylizes.In some embodiments, selection course 500 can be used for the size designing pump 312,314.Example selection process 500 from module 502 start, perform any suitable initialize routine, and proceed to acquisition operation 504.Obtain the load curve that operation 504 obtains hydraulic system.The change of loading demand in the work cycle of hydraulic system of the load portion section of load curve display hydraulic system.Such as, in some embodiments, obtain operation 504 and run the numerical simulation of hydraulic system with mesh power demand.
Calculating operation 506 determines meta during the work cycle of hydraulic system or medium load demand.Sizing operation 508 determines the size requirement of pump-unit 300 to meet meta or medium load demand.Such as, sizing operation 508 determines the appropriate size of the first pump 312 and the appropriate size for the second pump 314.In some embodiments, such pump 312,314 is selected in sizing operation 508, and but its size configurations is the load exceeding meta load be less than greatest requirements significantly.In other implementations, such pump 312,314 is selected in sizing operation 508, and its size configurations is meta load.
Second obtains the flow curve along with work cycle that operation 510 obtains the hydraulic system for comprising selected pump 312,314.This flow curve based on the application of the pump 312,314 of construction size in operation 508, without any accumulator.Such as, in some embodiments, second obtain the numerical simulation that operation 510 runs hydraulic system and mate with the load portion section 330 of the fluid flow with hydraulic system that make self-pumping 312,314.
Second calculating operation 512 determines suitable first threshold power stage T1 and suitable Second Threshold power stage T2 based on power curve and flow curve.The control unit of hydraulic system is set to, and fills accumulator 340 when loading demand is reduced under first threshold level, and discharges accumulator 340 when loading demand rises on Second Threshold level.When loading demand is between the first and second threshold values, control unit isolation accumulator 340.First threshold values T1 is set to the value of the lowest power peak value lower than the requirement of VDP pumping system.But second threshold values T2 is set to the highest power peak lower than the requirement of VDP pumping system is much higher than the value of low peak.In some embodiments, threshold level T1, T2 are configured to the power demand of hydraulic system in the major part of work cycle is fallen in normal loading range.
By the flow restriction (such as the first and second threshold value T1, T2) of test operation 514 evaluating system.Such as, test operation 514 can run the other numerical simulation for hydraulic system in work cycle.In the numerical simulation of test operation 514 is run, hydraulic system comprises two pumps 312,314 and accumulator 340.Accumulator 340 is filled based on the first and second threshold level, isolates and discharges in numerical simulation.
Determination module 516 contrasts one or more flow restriction and checks the result of the numerical simulation performed by test operation 514.Such as, in some embodiments, whether whether determination module 516 check the Fluid Volume being guided to accumulator 340 during filling roughly equal with the Fluid Volume being guided to accumulator 340 at deenergized period thus pressure in accumulator 340 meets following equalities along with the change of work cycle:
If it is determined that module 516 determine first threshold be set enough high thus the Fluid Volume flowing to accumulator 340 in a duty cycle during filling at least with the Fluid Volume requiring to be discharged by accumulator 340 as many, then select operation 500 to perform any completing program and terminating in termination module 518 suitably.But, if it is determined that module 516 determines that the Fluid Volume flowing to accumulator 340 during filling is inadequate, then in adjustment operation 520, first threshold level is increased, and select operation 500 to turn back to test operation 514 again to start (test).
Above-mentioned embodiment, citing and data provide the description of the manufacture of combination of the present invention and the complete of use.Because can realize multiple embodiments of the invention without departing from the spirit and scope of the present invention, the present invention is limited by incidental claim.
Claims (16)
1., for driving a hydraulic driving system for load, this hydraulic driving system comprises:
Live axle;
By the first oil hydraulic pump and second oil hydraulic pump of described drive shaft, at least described second oil hydraulic pump is variable displacement bidirectional pump, described first oil hydraulic pump has the outlet be communicated with the supply lines fluid being connected to described load and the entrance be communicated with cistern fluid, and described second oil hydraulic pump has the first pumping hole be communicated with described supply lines fluid and the second pumping hole be optionally communicated with hydraulic fluid accumulator fluid with described cistern;
Operate the control system of described hydraulic driving system in different modes, described various modes comprises: a) first mode, and wherein said second oil hydraulic pump is from described supply lines to described accumulator pumping hydraulic fluid; B) the second pattern, wherein said second oil hydraulic pump is from described accumulator to described supply lines pumping hydraulic fluid; C) three-mode, wherein said second oil hydraulic pump is from described supply lines to described cistern pumping hydraulic fluid; And d) four-mode, wherein said second oil hydraulic pump is from described cistern to described supply lines pumping hydraulic fluid.
2. hydraulic driving system according to claim 1, wherein, when described load lower than predetermined comparatively Low threshold level and described accumulator is not filled time, described control system operates described hydraulic driving system with described first mode.
3. hydraulic driving system according to claim 2, wherein, when described load is higher than predetermined higher thresholds level, described control system operates described hydraulic driving system with described second pattern.
4. hydraulic driving system according to claim 1, wherein, when described load lower than predetermined comparatively Low threshold level and described accumulator is filled time, described control system operates described hydraulic driving system with described three-mode.
5. hydraulic driving system according to claim 3, wherein, when described load is between predetermined higher thresholds level and predetermined comparatively Low threshold level, described control system operates described hydraulic driving system with described four-mode.
6. hydraulic driving system according to claim 1, wherein, described live axle is rotated by electric motor.
7. hydraulic driving system according to claim 1, wherein, described first oil hydraulic pump is fixed displacement oil hydraulic pump.
8. hydraulic driving system according to claim 1, wherein, described control system comprises the selector valve with the first valve port, the second valve port and the 3rd valve port, described first valve port is communicated with described second pumping hole fluid, described second valve port is communicated with described fluid accumulator, and described 3rd valve port is communicated with described cistern fluid.
9. hydraulic driving system according to claim 8, wherein, described valve is the three-position valve with primary importance, the second place and the 3rd position, described in described primary importance, the first valve port is connected with described 3rd valve port and described accumulator and described first valve port are isolated, described in the described second place, the second valve port and described 3rd valve port and described first valve port are isolated, and described in described 3rd position, the first valve port is connected with described second valve port and described 3rd valve port and described first valve port are isolated.
10., for operating hydraulic driving system to drive a method for load, described hydraulic driving system comprises by common shaft-driven first oil hydraulic pump and the second oil hydraulic pump, and at least described second pump is two-way pump, and described method comprises:
When load be in higher thresholds level and comparatively between Low threshold level time, utilize two oil hydraulic pumps from cistern to supply lines pumping hydraulic fluid;
When load is lower than described comparatively Low threshold level, utilize described second oil hydraulic pump from described supply lines to accumulator pumping hydraulic fluid; And
When load is higher than described higher thresholds level, utilize described second oil hydraulic pump from described accumulator to described supply lines pumping hydraulic fluid.
11. methods according to claim 10, also comprise when load lower than described comparatively Low threshold level and described accumulator is filled time, utilize described second oil hydraulic pump from described supply lines to described cistern pumping hydraulic fluid.
12. methods according to claim 10, wherein, described first oil hydraulic pump is fixed displacement pump, and described second oil hydraulic pump is variable delivery pump.
13. 1 kinds for providing the hydraulic driving system of power for load, this hydraulic driving system comprises:
For the pump-unit to supply lines pumping hydraulic fluid, this pump-unit comprises the variable delivery pump by electrical motor driven;
Hydraulic fluid accumulator; With
Valve, described valve is used for optionally described hydraulic fluid accumulator and described pump-unit being connected in the mode that fluid is communicated with and being used for described hydraulic fluid accumulator and described pump-unit to isolate,
Wherein, the first and second proportional flow control valves are in described variable delivery pump downstream along described supply lines tandem arrangement, and the position of described accumulator between described first and second proportional flow control valves is connected to described supply lines.
14. hydraulic driving systems according to claim 13, also comprise safety valve, and the position of this safety valve between described accumulator and described first proportional flow control valve is connected to described supply lines.
15. 1 kinds for providing the hydraulic driving system of power for load, this hydraulic driving system comprises:
For the pump-unit to supply lines pumping hydraulic fluid, this pump-unit is selected from following group: a) by the variable delivery pump of electrical motor driven; And the b) fixed displacement pump that driven by variable frequency drives;
Hydraulic fluid accumulator; With
Valve, described valve is used for optionally described hydraulic fluid accumulator and described pump-unit being connected in the mode that fluid is communicated with and being used for described hydraulic fluid accumulator and described pump-unit to isolate,
Wherein, described pump-unit comprises the first pump and the second pump, described second pump is by the variable delivery pump of electrical motor driven, described variable delivery pump is two-way pump, described first pump and described second pump are all by common drive shaft, described first pump and described second pump all have the first be communicated with described supply lines fluid, and second mouthful that described second pump is communicated with described hydraulic fluid accumulator fluid selectively.
16. hydraulic driving systems according to claim 15, wherein, described first pump has second mouthful that is communicated with cistern fluid all the time, and second mouthful of described second pump is optionally communicated with described cistern fluid.
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| US61/393,556 | 2010-10-15 | ||
| PCT/US2011/056406 WO2012051560A1 (en) | 2010-10-15 | 2011-10-14 | Hybrid hydraulic systems for industrial processes |
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| CN103249950A CN103249950A (en) | 2013-08-14 |
| CN103249950B true CN103249950B (en) | 2015-07-22 |
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| US6280170B1 (en) * | 1998-08-11 | 2001-08-28 | Toshiba Kikai Kabushiki Kaisha | Hydraulic control system for an injection molding machine |
| US6216456B1 (en) * | 1999-11-15 | 2001-04-17 | Caterpillar Inc. | Load sensing hydraulic control system for variable displacement pump |
| CN1394273A (en) * | 2000-01-10 | 2003-01-29 | 美国环境保护署 | Hydraulic hybrid vehicle |
| EP1287968A2 (en) * | 2001-08-30 | 2003-03-05 | Mitsubishi Heavy Industries, Ltd. | Injection molding machine, hydraulic actuating mechanism of injection molding machine, and control method therefor |
| DE10152198A1 (en) * | 2001-10-23 | 2003-05-08 | Siemens Ag | Electric plastic injection molding machine comprises a drivable cylinder with an inner rotatable worm, a closure unit and a removal unit |
| CN1989303A (en) * | 2004-07-26 | 2007-06-27 | 沃尔沃建造设备控股（瑞典）有限公司 | Apparatus and method for controlling work vehicle |
Also Published As
| Publication number | Publication date |
|---|---|
| US20120090308A1 (en) | 2012-04-19 |
| US9874233B2 (en) | 2018-01-23 |
| CA2814728A1 (en) | 2012-04-19 |
| EP2627906B1 (en) | 2018-12-05 |
| CN103249950A (en) | 2013-08-14 |
| KR20130125757A (en) | 2013-11-19 |
| US20150361996A1 (en) | 2015-12-17 |
| EP2627906A1 (en) | 2013-08-21 |
| US8991167B2 (en) | 2015-03-31 |
| JP2013545941A (en) | 2013-12-26 |
| BR112013009154A2 (en) | 2019-09-24 |
| WO2012051560A1 (en) | 2012-04-19 |
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